Jason Koglin

Stanford University, SLAC National Accelerator Laboratory, Engineering Physicist

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Papers by Jason Koglin

The General Antiparticle Spectrometer (GAPS) - Dark matter search using cosmic-ray antideuterons

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NuSTAR hard x-ray optics

Optics For Euv X Ray and Gamma Ray Astronomy Ii, Aug 1, 2005

The Nuclear Spectroscopic Telescope Array (NuSTAR) is a small explorer (SMEX) mission currently u... more The Nuclear Spectroscopic Telescope Array (NuSTAR) is a small explorer (SMEX) mission currently under an extended Phase A study by NASA. NuSTAR will be the first satellite mission to employ focusing optics in the hard X-ray band (8-80 keV). Its design eliminates high detector backgrounds, allows true imaging, and permits the use of compact high performance detectors. The result: a combination of clarity, sensitivity, and spectral resolution surpassing the largest observatories that have operated in this band by orders of magnitude. We present an overview of the NuSTAR optics design and production process. We also describe the progress of several components of our independent optics development program that are beginning to reach maturity and could possibly be incorporated into the NuSTAR production scheme. We then present environmental test results that are being conducted in preparation of full space qualification of the NuSTAR optics.

Performance of The Nuclear Spectroscopic Array

The Nuclear Spectroscopic Telescope Array (NuSTAR) will be the first focusing telescope on orbit ... more The Nuclear Spectroscopic Telescope Array (NuSTAR) will be the first focusing telescope on orbit to operate in the high energy X-ray band (6 - 79 keV). This Small Explorer Mission is currently under development, and is scheduled for launch in 2011. In this poster we describe the detailed performance characteristics the hard X-ray multilayer optics and shielded solid state focal plane detectors. We describe the expected throughput, spectroscopy and imaging properties of the observatory, as well as the planned data analysis and archiving plans.

Evaluation of epoxy for use in NuSTAR optics

Proceedings of Spie the International Society For Optical Engineering, 2009

NuSTAR on-ground calibration: II. Effective area

Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 2012

ABSTRACT The Nuclear Spectroscopic Telescope ARray (NuSTAR) was launched in June 2012 carrying th... more ABSTRACT The Nuclear Spectroscopic Telescope ARray (NuSTAR) was launched in June 2012 carrying the first focusing hard X-ray (5-80keV) optics to orbit. The multilayer coating was carried out at the Technical University of Denmark (DTU Space). In this article we introduce the NuSTAR multilayer reference database and its implementation in the NuSTAR optic response model. The database and its implementation is validated using on-ground effective area calibration data and used to estimate in-orbit performance.

The Rainwater Memorial Calibration Facility for X-Ray Optics

X-Ray and Optics Instrumentation, 2011

Abstract The Nuclear Spectroscopic Telescope ARray (NuSTAR) is a NASA Small Explorer mission that... more

NuSTAR ground calibration: The Rainwater Memorial Calibration Facility (RaMCaF)

Optics For Euv, X-Ray, and Gamma-Ray Astronomy V, 2011

ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) is a NASA Small Explorer mission that... more

Coatings for the NuSTAR mission

Optics For Euv, X-Ray, and Gamma-Ray Astronomy V, 2011

The NuSTAR mission will be the first mission to carry a hard X-ray(5-80 keV) focusing telescope t... more The NuSTAR mission will be the first mission to carry a hard X-ray(5-80 keV) focusing telescope to orbit. The optics are based on the use of multilayer coated thin slumped glass. Two different material combinations were used for the flight optics, namely W/Si and Pt/C. In this paper we describe the entire coating effort including the final coating design that was used for the two flight optics. We also present data on the performance verification of the coatings both on Si witness samples as well as on individual flight mirrors.

format_quoteNuSTAR will provide a 100-fold increase in sensitivity in the hard X-ray band, charting a new course in high energy astrophysics.format_quote

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NuSTAR on-ground calibration I: Imaging quality

Space Telescopes and Instrumentation 2012: Ultraviolet To Gamma Ray, 2012

ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) launched in June 2012 carries the fir... more ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) launched in June 2012 carries the first focusing hard Xray (5 - 80 keV) telescope to orbit. The on-ground calibration was performed at the RaMCaF facility at Nevis, Columbia University. During the assembly of the telescopes, mechanical surface metrology provided surface maps of the reflecting surfaces. Several flight coated mirrors were brought to BNL for scattering measurements. The information from both sources is fed to a raytracing code that is tested against the on-ground calibration data. The code is subsequently used for predicting the imaging properties for X-ray sources at infinite distance.

Application of an EMCCD Camera for Calibration of Hard X-Ray Telescopes

by Vivek Nagarkar and Jason Koglin

Space Telescopes and Instrumentation 2012: Ultraviolet To Gamma Ray, 2012

Recent technological innovations now make it feasible to construct hard x-ray telescopes for spac... more Recent technological innovations now make it feasible to construct hard x-ray telescopes for space-based astronomical missions. Focusing optics are capable of improving the sensitivity in the energy range above 10 keV by orders of magnitude compared to previously used instruments. The last decade has seen focusing optics developed for balloon experiments [1] and they will soon be implemented in approved space missions such as the Nuclear

format_quoteAll three NuSTAR telescopes underwent comprehensive calibration using the EMCCD camera, ensuring accurate performance evaluation.format_quote

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X-ray study of W/Si multilayers for the HEFT hard x-ray telescope

Optics for EUV, X-Ray, and Gamma-Ray Astronomy, 2004

This paper outlines an in-depth study of the W/Si coated mirrors for the High Energy Focusing Tel... more This paper outlines an in-depth study of the W/Si coated mirrors for the High Energy Focusing Telescope (HEFT). We present data taken at 8, 40 and 60 keV obtained at the Danish Space Research Institute and the European Synchrotron Radiation Facility in Grenoble. The set of samples were chosen to cover the parameter space of sample type, sample size and

Fabrication of the NuSTAR flight optics

Optics for EUV, X-Ray, and Gamma-Ray Astronomy V, 2011

We describe the fabrication of the two NuSTAR flight optics modules. The NuSTAR optics modules ar... more We describe the fabrication of the two NuSTAR flight optics modules. The NuSTAR optics modules are glass-graphiteepoxy composite structures to be employed for the first time in space-based X-ray optics by NuSTAR, a NASA Small Explorer schedule for launch in February 2012. We discuss the optics manufacturing process, the qualification and environmental testing performed, and briefly discuss the results of X-ray performance testing of the two modules. The integration and alignment of the completed flight optics modules into the NuSTAR instrument is described as are the optics module thermal shields.

format_quoteAssembly logistics were intensive, with technicians assembling an average of 11 layers per week under tight schedules, ensuring timely build completion.format_quote

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THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY ( NuSTAR ) HIGH-ENERGY X-RAY MISSION

The Astrophysical Journal, 2013

Reflection-mode scanning near-field optical microscopy using an apertureless metallic tip

Applied Optics, 1997

Recently, a reflection-mode near-field optical microscope with an apertureless tungsten tip has b... more Recently, a reflection-mode near-field optical microscope with an apertureless tungsten tip has been introduced and 100-nm resolution has been achieved ͓R. Bachelot, P. Gleyzes, and A. C. Boccara, Microsc. Microanal. Microstruc. 5, 389 -397 ͑1994͔͒. The optical signal is recorded in parallel with a tappingmode atomic force microscope signal. By showing several images here, we confirm the capabilities of this device and clearly demonstrate a 20-nm ͑ϳ͞35͒ resolution that has been achieved with smaller tips. A study of these images shows that both the topography and the near electromagnetic field of the sample can be independently probed by this device. Additionally, we discuss the principle of our approach, notably on the basis of interference phenomena between a Rayleigh scatterer and its image through the reflecting surface, and some of the setup's experimental characteristics are presented.

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